No external emails

Home Forums Messaging Software Exchange 2007 / 2010 / 2013 No external emails

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    As most thread starters, I hope someone can help.I recently migrated from windows sbs 2003 to a new sbs 2008 server, will little problems. Emails were working fine incoming and outgoing. Yesterday morning, all external emails stopped coming in. All internal emails are still fine from all users and emails outgoing are fine also.I can l telnet localhost 25 no problems but I cannot telnet either the ip address or the via the name. The mail flow trouble shooter shows no errors. Seems to me that the exchange is fine but the outside world suddenty cannot find my exchange server. Port forwarding is correct on the router. Only thing I can think of other than that is the DNS but I am unsure on where to beging?Appreciate any feedback.

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